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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 17 — Jun. 10, 2014
  • pp: 3706–3711

Generation of azimuthally polarized beams in fast axial flow CO2 laser with hybrid circular subwavelength grating mirror

Jiang Zhao, Bo Li, Heng Zhao, Wenjin Wang, Yi Hu, Sisi Liu, and Youqing Wang  »View Author Affiliations


Applied Optics, Vol. 53, Issue 17, pp. 3706-3711 (2014)
http://dx.doi.org/10.1364/AO.53.003706


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Abstract

A hybrid circular subwavelength grating mirror is proposed and fabricated as a rear mirror in a fast axial flow CO2 laser system to generate azimuthally polarized beams (APBs). This grating mirror, with particular gold-covered ridges and nanopillar-stuffed grooves, performs wideband TE wave reflectivity and high polarization selectivity. It shows that the polarization selectivity mechanism lies in the gold ridge’s high reflectivity to the TE wave and the lower TM wave reflectivity, which are the result of the mode leaking into substrate through the dielectric-like nanopillar layer. Finally, a high-quality 550 W APB is obtained in subsequent experiments, which provides potential applications in drilling and welding.

© 2014 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(140.0140) Lasers and laser optics : Lasers and laser optics
(230.5440) Optical devices : Polarization-selective devices
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Diffraction and Gratings

History
Original Manuscript: March 26, 2014
Revised Manuscript: May 7, 2014
Manuscript Accepted: May 7, 2014
Published: June 5, 2014

Citation
Jiang Zhao, Bo Li, Heng Zhao, Wenjin Wang, Yi Hu, Sisi Liu, and Youqing Wang, "Generation of azimuthally polarized beams in fast axial flow CO2 laser with hybrid circular subwavelength grating mirror," Appl. Opt. 53, 3706-3711 (2014)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-53-17-3706

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